FreeBSD/Linux Kernel Cross Reference
sys/amd64/include/atomic.h

     /*-
      * Copyright (c) 1998 Doug Rabson
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD: releng/11.0/sys/amd64/include/atomic.h 299912 2016-05-16 07:19:33Z sephe $
     */
    #ifndef _MACHINE_ATOMIC_H_
    #define _MACHINE_ATOMIC_H_
    
    #ifndef _SYS_CDEFS_H_
    #error this file needs sys/cdefs.h as a prerequisite
    #endif
    
    /*
     * To express interprocessor (as opposed to processor and device) memory
     * ordering constraints, use the atomic_*() functions with acquire and release
     * semantics rather than the *mb() functions.  An architecture's memory
     * ordering (or memory consistency) model governs the order in which a
     * program's accesses to different locations may be performed by an
     * implementation of that architecture.  In general, for memory regions
     * defined as writeback cacheable, the memory ordering implemented by amd64
     * processors preserves the program ordering of a load followed by a load, a
     * load followed by a store, and a store followed by a store.  Only a store
     * followed by a load to a different memory location may be reordered.
     * Therefore, except for special cases, like non-temporal memory accesses or
     * memory regions defined as write combining, the memory ordering effects
     * provided by the sfence instruction in the wmb() function and the lfence
     * instruction in the rmb() function are redundant.  In contrast, the
     * atomic_*() functions with acquire and release semantics do not perform
     * redundant instructions for ordinary cases of interprocessor memory
     * ordering on any architecture.
     */
    #define mb()    __asm __volatile("mfence;" : : : "memory")
    #define wmb()   __asm __volatile("sfence;" : : : "memory")
    #define rmb()   __asm __volatile("lfence;" : : : "memory")
    
    /*
     * Various simple operations on memory, each of which is atomic in the
     * presence of interrupts and multiple processors.
     *
     * atomic_set_char(P, V)        (*(u_char *)(P) |= (V))
     * atomic_clear_char(P, V)      (*(u_char *)(P) &= ~(V))
     * atomic_add_char(P, V)        (*(u_char *)(P) += (V))
     * atomic_subtract_char(P, V)   (*(u_char *)(P) -= (V))
     *
     * atomic_set_short(P, V)       (*(u_short *)(P) |= (V))
     * atomic_clear_short(P, V)     (*(u_short *)(P) &= ~(V))
     * atomic_add_short(P, V)       (*(u_short *)(P) += (V))
     * atomic_subtract_short(P, V)  (*(u_short *)(P) -= (V))
     *
     * atomic_set_int(P, V)         (*(u_int *)(P) |= (V))
     * atomic_clear_int(P, V)       (*(u_int *)(P) &= ~(V))
     * atomic_add_int(P, V)         (*(u_int *)(P) += (V))
     * atomic_subtract_int(P, V)    (*(u_int *)(P) -= (V))
     * atomic_swap_int(P, V)        (return (*(u_int *)(P)); *(u_int *)(P) = (V);)
     * atomic_readandclear_int(P)   (return (*(u_int *)(P)); *(u_int *)(P) = 0;)
     *
     * atomic_set_long(P, V)        (*(u_long *)(P) |= (V))
     * atomic_clear_long(P, V)      (*(u_long *)(P) &= ~(V))
     * atomic_add_long(P, V)        (*(u_long *)(P) += (V))
     * atomic_subtract_long(P, V)   (*(u_long *)(P) -= (V))
     * atomic_swap_long(P, V)       (return (*(u_long *)(P)); *(u_long *)(P) = (V);)
     * atomic_readandclear_long(P)  (return (*(u_long *)(P)); *(u_long *)(P) = 0;)
     */
    
    /*
     * The above functions are expanded inline in the statically-linked
     * kernel.  Lock prefixes are generated if an SMP kernel is being
     * built.
     *
     * Kernel modules call real functions which are built into the kernel.
     * This allows kernel modules to be portable between UP and SMP systems.
     */
    #if defined(KLD_MODULE) || !defined(__GNUCLIKE_ASM)
    #define ATOMIC_ASM(NAME, TYPE, OP, CONS, V)                     \
    void atomic_##NAME##_##TYPE(volatile u_##TYPE *p, u_##TYPE v);  \
    void atomic_##NAME##_barr_##TYPE(volatile u_##TYPE *p, u_##TYPE v)
    
   int     atomic_cmpset_int(volatile u_int *dst, u_int expect, u_int src);
   int     atomic_cmpset_long(volatile u_long *dst, u_long expect, u_long src);
   u_int   atomic_fetchadd_int(volatile u_int *p, u_int v);
   u_long  atomic_fetchadd_long(volatile u_long *p, u_long v);
   int     atomic_testandset_int(volatile u_int *p, u_int v);
   int     atomic_testandset_long(volatile u_long *p, u_int v);
   int     atomic_testandclear_int(volatile u_int *p, u_int v);
   int     atomic_testandclear_long(volatile u_long *p, u_int v);
   void    atomic_thread_fence_acq(void);
   void    atomic_thread_fence_acq_rel(void);
   void    atomic_thread_fence_rel(void);
   void    atomic_thread_fence_seq_cst(void);
   
   #define ATOMIC_LOAD(TYPE)                                       \
   u_##TYPE        atomic_load_acq_##TYPE(volatile u_##TYPE *p)
   #define ATOMIC_STORE(TYPE)                                      \
   void            atomic_store_rel_##TYPE(volatile u_##TYPE *p, u_##TYPE v)
   
   #else /* !KLD_MODULE && __GNUCLIKE_ASM */
   
   /*
    * For userland, always use lock prefixes so that the binaries will run
    * on both SMP and !SMP systems.
    */
   #if defined(SMP) || !defined(_KERNEL)
   #define MPLOCKED        "lock ; "
   #else
   #define MPLOCKED
   #endif
   
   /*
    * The assembly is volatilized to avoid code chunk removal by the compiler.
    * GCC aggressively reorders operations and memory clobbering is necessary
    * in order to avoid that for memory barriers.
    */
   #define ATOMIC_ASM(NAME, TYPE, OP, CONS, V)             \
   static __inline void                                    \
   atomic_##NAME##_##TYPE(volatile u_##TYPE *p, u_##TYPE v)\
   {                                                       \
           __asm __volatile(MPLOCKED OP                    \
           : "+m" (*p)                                     \
           : CONS (V)                                      \
           : "cc");                                        \
   }                                                       \
                                                           \
   static __inline void                                    \
   atomic_##NAME##_barr_##TYPE(volatile u_##TYPE *p, u_##TYPE v)\
   {                                                       \
           __asm __volatile(MPLOCKED OP                    \
           : "+m" (*p)                                     \
           : CONS (V)                                      \
           : "memory", "cc");                              \
   }                                                       \
   struct __hack
   
   /*
    * Atomic compare and set, used by the mutex functions
    *
    * if (*dst == expect) *dst = src (all 32 bit words)
    *
    * Returns 0 on failure, non-zero on success
    */
   
   static __inline int
   atomic_cmpset_int(volatile u_int *dst, u_int expect, u_int src)
   {
           u_char res;
   
           __asm __volatile(
           "       " MPLOCKED "            "
           "       cmpxchgl %3,%1 ;        "
           "       sete    %0 ;            "
           "# atomic_cmpset_int"
           : "=q" (res),                   /* 0 */
             "+m" (*dst),                  /* 1 */
             "+a" (expect)                 /* 2 */
           : "r" (src)                     /* 3 */
           : "memory", "cc");
           return (res);
   }
   
   static __inline int
   atomic_cmpset_long(volatile u_long *dst, u_long expect, u_long src)
   {
           u_char res;
   
           __asm __volatile(
           "       " MPLOCKED "            "
           "       cmpxchgq %3,%1 ;        "
           "       sete    %0 ;            "
           "# atomic_cmpset_long"
           : "=q" (res),                   /* 0 */
             "+m" (*dst),                  /* 1 */
             "+a" (expect)                 /* 2 */
           : "r" (src)                     /* 3 */
           : "memory", "cc");
           return (res);
   }
   
   /*
    * Atomically add the value of v to the integer pointed to by p and return
    * the previous value of *p.
    */
   static __inline u_int
   atomic_fetchadd_int(volatile u_int *p, u_int v)
   {
   
           __asm __volatile(
           "       " MPLOCKED "            "
           "       xaddl   %0,%1 ;         "
           "# atomic_fetchadd_int"
           : "+r" (v),                     /* 0 */
             "+m" (*p)                     /* 1 */
           : : "cc");
           return (v);
   }
   
   /*
    * Atomically add the value of v to the long integer pointed to by p and return
    * the previous value of *p.
    */
   static __inline u_long
   atomic_fetchadd_long(volatile u_long *p, u_long v)
   {
   
           __asm __volatile(
           "       " MPLOCKED "            "
           "       xaddq   %0,%1 ;         "
           "# atomic_fetchadd_long"
           : "+r" (v),                     /* 0 */
             "+m" (*p)                     /* 1 */
           : : "cc");
           return (v);
   }
   
   static __inline int
   atomic_testandset_int(volatile u_int *p, u_int v)
   {
           u_char res;
   
           __asm __volatile(
           "       " MPLOCKED "            "
           "       btsl    %2,%1 ;         "
           "       setc    %0 ;            "
           "# atomic_testandset_int"
           : "=q" (res),                   /* 0 */
             "+m" (*p)                     /* 1 */
           : "Ir" (v & 0x1f)               /* 2 */
           : "cc");
           return (res);
   }
   
   static __inline int
   atomic_testandset_long(volatile u_long *p, u_int v)
   {
           u_char res;
   
           __asm __volatile(
           "       " MPLOCKED "            "
           "       btsq    %2,%1 ;         "
           "       setc    %0 ;            "
           "# atomic_testandset_long"
           : "=q" (res),                   /* 0 */
             "+m" (*p)                     /* 1 */
           : "Jr" ((u_long)(v & 0x3f))     /* 2 */
           : "cc");
           return (res);
   }
   
   static __inline int
   atomic_testandclear_int(volatile u_int *p, u_int v)
   {
           u_char res;
   
           __asm __volatile(
           "       " MPLOCKED "            "
           "       btrl    %2,%1 ;         "
           "       setc    %0 ;            "
           "# atomic_testandclear_int"
           : "=q" (res),                   /* 0 */
             "+m" (*p)                     /* 1 */
           : "Ir" (v & 0x1f)               /* 2 */
           : "cc");
           return (res);
   }
   
   static __inline int
   atomic_testandclear_long(volatile u_long *p, u_int v)
   {
           u_char res;
   
           __asm __volatile(
           "       " MPLOCKED "            "
           "       btrq    %2,%1 ;         "
           "       setc    %0 ;            "
           "# atomic_testandclear_long"
           : "=q" (res),                   /* 0 */
             "+m" (*p)                     /* 1 */
           : "Jr" ((u_long)(v & 0x3f))     /* 2 */
           : "cc");
           return (res);
   }
   
   /*
    * We assume that a = b will do atomic loads and stores.  Due to the
    * IA32 memory model, a simple store guarantees release semantics.
    *
    * However, a load may pass a store if they are performed on distinct
    * addresses, so we need a Store/Load barrier for sequentially
    * consistent fences in SMP kernels.  We use "lock addl $0,mem" for a
    * Store/Load barrier, as recommended by the AMD Software Optimization
    * Guide, and not mfence.  To avoid false data dependencies, we use a
    * special address for "mem".  In the kernel, we use a private per-cpu
    * cache line.  In user space, we use a word in the stack's red zone
    * (-8(%rsp)).
    *
    * For UP kernels, however, the memory of the single processor is
    * always consistent, so we only need to stop the compiler from
    * reordering accesses in a way that violates the semantics of acquire
    * and release.
    */
   
   #if defined(_KERNEL)
   
   /*
    * OFFSETOF_MONITORBUF == __pcpu_offset(pc_monitorbuf).
    *
    * The open-coded number is used instead of the symbolic expression to
    * avoid a dependency on sys/pcpu.h in machine/atomic.h consumers.
    * An assertion in amd64/vm_machdep.c ensures that the value is correct.
    */
   #define OFFSETOF_MONITORBUF     0x180
   
   #if defined(SMP)
   static __inline void
   __storeload_barrier(void)
   {
   
           __asm __volatile("lock; addl $0,%%gs:%0"
               : "+m" (*(u_int *)OFFSETOF_MONITORBUF) : : "memory", "cc");
   }
   #else /* _KERNEL && UP */
   static __inline void
   __storeload_barrier(void)
   {
   
           __compiler_membar();
   }
   #endif /* SMP */
   #else /* !_KERNEL */
   static __inline void
   __storeload_barrier(void)
   {
   
           __asm __volatile("lock; addl $0,-8(%%rsp)" : : : "memory", "cc");
   }
   #endif /* _KERNEL*/
   
   #define ATOMIC_LOAD(TYPE)                                       \
   static __inline u_##TYPE                                        \
   atomic_load_acq_##TYPE(volatile u_##TYPE *p)                    \
   {                                                               \
           u_##TYPE res;                                           \
                                                                   \
           res = *p;                                               \
           __compiler_membar();                                    \
           return (res);                                           \
   }                                                               \
   struct __hack
   
   #define ATOMIC_STORE(TYPE)                                      \
   static __inline void                                            \
   atomic_store_rel_##TYPE(volatile u_##TYPE *p, u_##TYPE v)       \
   {                                                               \
                                                                   \
           __compiler_membar();                                    \
           *p = v;                                                 \
   }                                                               \
   struct __hack
   
   static __inline void
   atomic_thread_fence_acq(void)
   {
   
           __compiler_membar();
   }
   
   static __inline void
   atomic_thread_fence_rel(void)
   {
   
           __compiler_membar();
   }
   
   static __inline void
   atomic_thread_fence_acq_rel(void)
   {
   
           __compiler_membar();
   }
   
   static __inline void
   atomic_thread_fence_seq_cst(void)
   {
   
           __storeload_barrier();
   }
   
   #endif /* KLD_MODULE || !__GNUCLIKE_ASM */
   
   ATOMIC_ASM(set,      char,  "orb %b1,%0",  "iq",  v);
   ATOMIC_ASM(clear,    char,  "andb %b1,%0", "iq", ~v);
   ATOMIC_ASM(add,      char,  "addb %b1,%0", "iq",  v);
   ATOMIC_ASM(subtract, char,  "subb %b1,%0", "iq",  v);
   
   ATOMIC_ASM(set,      short, "orw %w1,%0",  "ir",  v);
   ATOMIC_ASM(clear,    short, "andw %w1,%0", "ir", ~v);
   ATOMIC_ASM(add,      short, "addw %w1,%0", "ir",  v);
   ATOMIC_ASM(subtract, short, "subw %w1,%0", "ir",  v);
   
   ATOMIC_ASM(set,      int,   "orl %1,%0",   "ir",  v);
   ATOMIC_ASM(clear,    int,   "andl %1,%0",  "ir", ~v);
   ATOMIC_ASM(add,      int,   "addl %1,%0",  "ir",  v);
   ATOMIC_ASM(subtract, int,   "subl %1,%0",  "ir",  v);
   
   ATOMIC_ASM(set,      long,  "orq %1,%0",   "ir",  v);
   ATOMIC_ASM(clear,    long,  "andq %1,%0",  "ir", ~v);
   ATOMIC_ASM(add,      long,  "addq %1,%0",  "ir",  v);
   ATOMIC_ASM(subtract, long,  "subq %1,%0",  "ir",  v);
   
   #define ATOMIC_LOADSTORE(TYPE)                                  \
           ATOMIC_LOAD(TYPE);                                      \
           ATOMIC_STORE(TYPE)
   
   ATOMIC_LOADSTORE(char);
   ATOMIC_LOADSTORE(short);
   ATOMIC_LOADSTORE(int);
   ATOMIC_LOADSTORE(long);
   
   #undef ATOMIC_ASM
   #undef ATOMIC_LOAD
   #undef ATOMIC_STORE
   #undef ATOMIC_LOADSTORE
   #ifndef WANT_FUNCTIONS
   
   /* Read the current value and store a new value in the destination. */
   #ifdef __GNUCLIKE_ASM
   
   static __inline u_int
   atomic_swap_int(volatile u_int *p, u_int v)
   {
   
           __asm __volatile(
           "       xchgl   %1,%0 ;         "
           "# atomic_swap_int"
           : "+r" (v),                     /* 0 */
             "+m" (*p));                   /* 1 */
           return (v);
   }
   
   static __inline u_long
   atomic_swap_long(volatile u_long *p, u_long v)
   {
   
           __asm __volatile(
           "       xchgq   %1,%0 ;         "
           "# atomic_swap_long"
           : "+r" (v),                     /* 0 */
             "+m" (*p));                   /* 1 */
           return (v);
   }
   
   #else /* !__GNUCLIKE_ASM */
   
   u_int   atomic_swap_int(volatile u_int *p, u_int v);
   u_long  atomic_swap_long(volatile u_long *p, u_long v);
   
   #endif /* __GNUCLIKE_ASM */
   
   #define atomic_set_acq_char             atomic_set_barr_char
   #define atomic_set_rel_char             atomic_set_barr_char
   #define atomic_clear_acq_char           atomic_clear_barr_char
   #define atomic_clear_rel_char           atomic_clear_barr_char
   #define atomic_add_acq_char             atomic_add_barr_char
   #define atomic_add_rel_char             atomic_add_barr_char
   #define atomic_subtract_acq_char        atomic_subtract_barr_char
   #define atomic_subtract_rel_char        atomic_subtract_barr_char
   
   #define atomic_set_acq_short            atomic_set_barr_short
   #define atomic_set_rel_short            atomic_set_barr_short
   #define atomic_clear_acq_short          atomic_clear_barr_short
   #define atomic_clear_rel_short          atomic_clear_barr_short
   #define atomic_add_acq_short            atomic_add_barr_short
   #define atomic_add_rel_short            atomic_add_barr_short
   #define atomic_subtract_acq_short       atomic_subtract_barr_short
   #define atomic_subtract_rel_short       atomic_subtract_barr_short
   
   #define atomic_set_acq_int              atomic_set_barr_int
   #define atomic_set_rel_int              atomic_set_barr_int
   #define atomic_clear_acq_int            atomic_clear_barr_int
   #define atomic_clear_rel_int            atomic_clear_barr_int
   #define atomic_add_acq_int              atomic_add_barr_int
   #define atomic_add_rel_int              atomic_add_barr_int
   #define atomic_subtract_acq_int         atomic_subtract_barr_int
   #define atomic_subtract_rel_int         atomic_subtract_barr_int
   #define atomic_cmpset_acq_int           atomic_cmpset_int
   #define atomic_cmpset_rel_int           atomic_cmpset_int
   
   #define atomic_set_acq_long             atomic_set_barr_long
   #define atomic_set_rel_long             atomic_set_barr_long
   #define atomic_clear_acq_long           atomic_clear_barr_long
   #define atomic_clear_rel_long           atomic_clear_barr_long
   #define atomic_add_acq_long             atomic_add_barr_long
   #define atomic_add_rel_long             atomic_add_barr_long
   #define atomic_subtract_acq_long        atomic_subtract_barr_long
   #define atomic_subtract_rel_long        atomic_subtract_barr_long
   #define atomic_cmpset_acq_long          atomic_cmpset_long
   #define atomic_cmpset_rel_long          atomic_cmpset_long
   
   #define atomic_readandclear_int(p)      atomic_swap_int(p, 0)
   #define atomic_readandclear_long(p)     atomic_swap_long(p, 0)
   
   /* Operations on 8-bit bytes. */
   #define atomic_set_8            atomic_set_char
   #define atomic_set_acq_8        atomic_set_acq_char
   #define atomic_set_rel_8        atomic_set_rel_char
   #define atomic_clear_8          atomic_clear_char
   #define atomic_clear_acq_8      atomic_clear_acq_char
   #define atomic_clear_rel_8      atomic_clear_rel_char
   #define atomic_add_8            atomic_add_char
   #define atomic_add_acq_8        atomic_add_acq_char
   #define atomic_add_rel_8        atomic_add_rel_char
   #define atomic_subtract_8       atomic_subtract_char
   #define atomic_subtract_acq_8   atomic_subtract_acq_char
   #define atomic_subtract_rel_8   atomic_subtract_rel_char
   #define atomic_load_acq_8       atomic_load_acq_char
   #define atomic_store_rel_8      atomic_store_rel_char
   
   /* Operations on 16-bit words. */
   #define atomic_set_16           atomic_set_short
   #define atomic_set_acq_16       atomic_set_acq_short
   #define atomic_set_rel_16       atomic_set_rel_short
   #define atomic_clear_16         atomic_clear_short
   #define atomic_clear_acq_16     atomic_clear_acq_short
   #define atomic_clear_rel_16     atomic_clear_rel_short
   #define atomic_add_16           atomic_add_short
   #define atomic_add_acq_16       atomic_add_acq_short
   #define atomic_add_rel_16       atomic_add_rel_short
   #define atomic_subtract_16      atomic_subtract_short
   #define atomic_subtract_acq_16  atomic_subtract_acq_short
   #define atomic_subtract_rel_16  atomic_subtract_rel_short
   #define atomic_load_acq_16      atomic_load_acq_short
   #define atomic_store_rel_16     atomic_store_rel_short
   
   /* Operations on 32-bit double words. */
   #define atomic_set_32           atomic_set_int
   #define atomic_set_acq_32       atomic_set_acq_int
   #define atomic_set_rel_32       atomic_set_rel_int
   #define atomic_clear_32         atomic_clear_int
   #define atomic_clear_acq_32     atomic_clear_acq_int
   #define atomic_clear_rel_32     atomic_clear_rel_int
   #define atomic_add_32           atomic_add_int
   #define atomic_add_acq_32       atomic_add_acq_int
   #define atomic_add_rel_32       atomic_add_rel_int
   #define atomic_subtract_32      atomic_subtract_int
   #define atomic_subtract_acq_32  atomic_subtract_acq_int
   #define atomic_subtract_rel_32  atomic_subtract_rel_int
   #define atomic_load_acq_32      atomic_load_acq_int
   #define atomic_store_rel_32     atomic_store_rel_int
   #define atomic_cmpset_32        atomic_cmpset_int
   #define atomic_cmpset_acq_32    atomic_cmpset_acq_int
   #define atomic_cmpset_rel_32    atomic_cmpset_rel_int
   #define atomic_swap_32          atomic_swap_int
   #define atomic_readandclear_32  atomic_readandclear_int
   #define atomic_fetchadd_32      atomic_fetchadd_int
   #define atomic_testandset_32    atomic_testandset_int
   #define atomic_testandclear_32  atomic_testandclear_int
   
   /* Operations on 64-bit quad words. */
   #define atomic_set_64           atomic_set_long
   #define atomic_set_acq_64       atomic_set_acq_long
   #define atomic_set_rel_64       atomic_set_rel_long
   #define atomic_clear_64         atomic_clear_long
   #define atomic_clear_acq_64     atomic_clear_acq_long
   #define atomic_clear_rel_64     atomic_clear_rel_long
   #define atomic_add_64           atomic_add_long
   #define atomic_add_acq_64       atomic_add_acq_long
   #define atomic_add_rel_64       atomic_add_rel_long
   #define atomic_subtract_64      atomic_subtract_long
   #define atomic_subtract_acq_64  atomic_subtract_acq_long
   #define atomic_subtract_rel_64  atomic_subtract_rel_long
   #define atomic_load_acq_64      atomic_load_acq_long
   #define atomic_store_rel_64     atomic_store_rel_long
   #define atomic_cmpset_64        atomic_cmpset_long
   #define atomic_cmpset_acq_64    atomic_cmpset_acq_long
   #define atomic_cmpset_rel_64    atomic_cmpset_rel_long
   #define atomic_swap_64          atomic_swap_long
   #define atomic_readandclear_64  atomic_readandclear_long
   #define atomic_fetchadd_64      atomic_fetchadd_long
   #define atomic_testandset_64    atomic_testandset_long
   #define atomic_testandclear_64  atomic_testandclear_long
   
   /* Operations on pointers. */
   #define atomic_set_ptr          atomic_set_long
   #define atomic_set_acq_ptr      atomic_set_acq_long
   #define atomic_set_rel_ptr      atomic_set_rel_long
   #define atomic_clear_ptr        atomic_clear_long
   #define atomic_clear_acq_ptr    atomic_clear_acq_long
   #define atomic_clear_rel_ptr    atomic_clear_rel_long
   #define atomic_add_ptr          atomic_add_long
   #define atomic_add_acq_ptr      atomic_add_acq_long
   #define atomic_add_rel_ptr      atomic_add_rel_long
   #define atomic_subtract_ptr     atomic_subtract_long
   #define atomic_subtract_acq_ptr atomic_subtract_acq_long
   #define atomic_subtract_rel_ptr atomic_subtract_rel_long
   #define atomic_load_acq_ptr     atomic_load_acq_long
   #define atomic_store_rel_ptr    atomic_store_rel_long
   #define atomic_cmpset_ptr       atomic_cmpset_long
   #define atomic_cmpset_acq_ptr   atomic_cmpset_acq_long
   #define atomic_cmpset_rel_ptr   atomic_cmpset_rel_long
   #define atomic_swap_ptr         atomic_swap_long
   #define atomic_readandclear_ptr atomic_readandclear_long
   
   #endif /* !WANT_FUNCTIONS */
   
   #endif /* !_MACHINE_ATOMIC_H_ */

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